55 
Shells of this genus, but not in a state to allow of their species being 
determined, are also found in the Vincentine territory. 
XIII. Ancilla. An oblong subcylindrical univalve, with a short 
spire, not channeled : the aperture effused, and its base slightly 
notched. A thick oblique fold at the base of the columella. 
The separation of these shells from those of the genus Oliva, 
appears to be hardly necessary ; the only material difference being, 
that those which he places under the latter genus have not the turns 
of the spiie separated by a channel, as is the case with those which 
are allotted to the former genus. Four species of these shells are 
found at Gngnon and Courtagnon : A. huccinoides, A. subulata. A. 
olivula, and A. canalifera. 
The characteristic of the genus Valuta, of Linnaeus, the folded colu- 
mella, is doubtlessly much too general, and belongs to many shells 
which require to be arranged under separate genera. Bruguiere, in 
the first place, separated those shells which were not notched at their 
base : since which, Lamarck has taken from this Linnaean genus such 
shells as appeared to him to be capable of forming the new genera, 
mttra i colornbella, marginella, cancellaria, and turbinella. 
XIV. Valuta. An ovate subventricose univalve ; the apex papillary, 
and base emarginated. The columella plicated : the inferior plicae 
being largest or longest. 
In this genus are comprised, Voluta cithara, Lam. Encyc. Tab. 
384, Fig. 1 ; Cithareedus, Chemn. Vol. XI. p. 297, Tab. 212, Fig. 
2098, 2099. This shell is remarkable for the beautiful polish which 
it retains. V. spinosa, Lam.; Strombus spinosus, Linn.; &. luctator, 
Brand, Foss. Fig. 65, List. Tab. 1033. This shell is singularly beautiful’ 
retaining not only its perfect form and its polish, but its orange- 
coloured transverse stripes. V muscialis, Lam. is Sir. luctator, Brand, 
Fig. 65. In V. muricina and V. costaria, of Lamarck, is instanced 
the ambiguity so frequently observable in fossil shells : the general 
form of murex in the former, and oifusus in the latter of these shells 
